.topnav {
    background-color: #333;
    height: 40px;
}

.topnav-menu li a {
    border-right: 1px solid #424242;
    padding: 0 7px;
    font-size: 12px;
    color: #b0b0b0;
    line-height: 40px;
}

.topnav-menu a:hover {
    color: #fff;
}

.topnav-menu li:last-child a {
    border-right: none;
}

.topnav-menu li:first-child a {
    padding-left: 0;
}

.topnav-car{
    background-color: #424242;
    width: 120px;
    height: 40px;
    position: relative;
    margin-left: 15px;
}
.topnav-car a{
    width: 100%;
    height: 100%;
    line-height: 40px;
    text-align: center;
    display: block;
    color: #b0b0b0;
}
.topnav-car-detail{
    width: 316px;
    height: 100px;
    line-height: 100px;
    background-color: #fff;
    position: absolute;
    right:0;
    top:40px;
    text-align: center;
    display: none;
    border: 1px solid #eee;
    z-index: 51;
}
.topnav-car:hover .topnav-car-detail{
    display: block;
}
.topnav-car:hover a{
    color: #ff0000;
    background-color: #fff;
}